From the medieval European belief that royalty and nobility had blueblood; the elite had enough power and wealth that they could afford to have peasants and the urban poor do their dirty work for them- since the aristocrats were able to stay inside and avoid long hours in the fields (and the sunlight), they were often so pale that their blue veins showed under their translucent skin, thus leading people to believe that their blood was blue.

Now it generally refers to people from old money: families who have been wealthy aristocrats for generations on generations.

The first novel in the vampire series by Melissa De La Cruz. Set in the city of Manhattan, the city's supernatural elite are running rampatant. But mysterious cases of full consumptions are turning up; vampires are dying!

Old school slang for common folks back in medieval times. Those of low class work in hard labor (agricultural) and spending majority of the time being exposed to the sun; so they tan. Where as the high class folks do nothing, but stay inside their homes; getting paler. So pale that their skin become--as some say like alabaster, that you can see their blue veins through their skin. Thus the word "Blue Blood".

it doesn't matter how hard your dad works, you'll never be a Blue Blood like us.

A person of noble birth. this group of people are born into an elite and noble family. Blue bloods generally reside on the East Coast (New England) and live privileged lifestyles. Many blue bloods attend prestigious boarding/preparatory schools, elite institutions (colleges and universities); summer in expensive vacation communities (i.e. Martha's Vineyard, Long Island, Maine, New Hampshire, etc.), and wear preppy clothes. Blue bloods are usually extremely affluent and tend to not flaunt there money. They come from "old money" and are the opposite of "nouveau riche".

President John F. Kennedy (JFK) is a blue blood.

Henry lives in Greenwich, Connecticut; summers in East Hampton, goes to Phillips Exeter Academy and plans to attend Yale in the fall. He's a blue blood.